Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 82,217	$ 125,888
Accounts receivable, net of allowances of $1,240 and $1,206, respectively	107,957	82,763
Inventories	46,594	31,554
Prepaid expenses	19,586	23,518
Deferred tax assets	0	12,446
Other current assets	7,774	7,215
Total current assets	264,128	283,384
Property and equipment, net	32,309	36,178
Long-term net investment in sales-type leases	14,484	10,848
Goodwill	147,906	122,720
Intangible assets, net	89,665	82,667
Long-term deferred tax assets	2,361	1,144
Other long-term assets	27,894	23,273
Total assets	578,747	560,214
Current liabilities:
Accounts payable	22,646	19,432
Accrued compensation	18,195	19,874
Accrued liabilities	30,133	19,299
Deferred service revenue	27,948	25,167
Deferred gross profit	25,708	28,558
Total current liabilities	124,630	112,330
Long-term deferred service revenue	17,975	20,308
Long-term deferred tax liabilities	21,822	30,454
Other long-term liabilities	11,932	7,024
Total liabilities	$ 176,359	$ 170,116
Commitments and contingencies
Stockholders’ equity:
Preferred stock, $0.001 par value, 5,000 shares authorized; no shares issued	$ 0	$ 0
Common stock, $0.001 par value, 100,000 shares authorized; 44,739 and 43,537 shares issued; 35,594 and 35,816 shares outstanding, respectively	45	43
Treasury stock at cost, 9,145 and 7,721 shares outstanding, respectively	(185,074)	(135,053)
Additional paid-in capital	490,354	457,436
Retained earnings	99,793	69,033
Accumulated other comprehensive income	(2,730)	(1,361)
Total stockholders’ equity	402,388	390,098
Total liabilities and stockholders’ equity	$ 578,747	$ 560,214